
Pre-assembled Megasquirts which require no modifications to work with the rotary are available (we will cover this later) but if you choose MS1 or MS2, they still require modifications to work with the rotary. If you have never soldered before or have no experience in basic electronics, then building a Megasquirt from scratch may not be for you. You may have to modify it to work with the rotary, and like any other standalone, you are in charge of wiring it up to make it work in your car. This means that if you want, you build the ECU. Nowhere has existed a complete 2nd Gen RX-7 Megasquirt write up until now.īefore we go any further, it is important to reinforce that the Megasquirt can be a very Do It Yourself ECU. This is the primary reason I've decided to do this writeup. However, the one disadvantage about the community approach is that information, even with the FAQs, can be a bit splintered and spread across various parts of the Internet. Ken, posting on the RX-7 forum as muythaibxr has created an excellent FAQ for MS1 and another FAQ for MSII.
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And it is mainly due to his work that we have full rotary support for every current version of the Megasquirt, from MS1 to MS3. As it turns out, Ken, one of the authors of the Megasquirt and Spark Extra (MS1 Extra / MSnSE, MS2 Extra, MS3 firmware) firmware, is an avid RX-7 enthusiast. Indeed, as the Megasquirt is an open-source community project, it only exists because of those people who have put their time and knowledge into creating it. Behind the Megasquirt is a huge community of users that are more then willing to help out. We'll get back to exactly what that means shortly.ĭon't let this deter you, however. Notice I said "some versions of the Megasquirt". In fact, some versions of the Megasquirt require one or two modifications for almost every application but as the rotary has a unique ignition system, it can be a bit more involved then most installations. This means that out of the box, some versions of the Megasquirt require modification to run the rotary. Do-it-yourself means that you save money by assembling it yourself with a few basic tools and comprehensive instructions.". However as the Megamanual says, " Experimental means that you are responsible for sorting out some details of your fuel injection that are specific to your application. It is an extremely capable and inexpensive DIY ECU. The Megasquirt has become a very popular ECU for the RX-7.
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